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Brand: PULS
PULS QS20.241 24V 20A 480W Single-Phase DIN Rail Power Supply
Description
480 W of 24 V with a 150 % short-term reserve
The PULS QS20.241 is the 24 V, 20 A model of the DIMENSION Q-Series single-phase range. The datasheet lists a 82 mm wide housing, efficiency up to 93.9 %, active power factor correction and a short-term BonusPower capability of 150 %: 30 A (720 W) for typically 4 seconds. PULS positions this reserve for starting motors, charging capacitors and absorbing reverse energy, noting that it often allows a supply from a lower wattage class to be used. Unlike the CP and CS series, the Q-Series uses bi-stable quick-connect spring-clamp terminals that ship open, so wiring needs no screwdriver for the power connections.
The same datasheet covers the QS20.241-A1 (ATEX and IECEx approved) and QS20.241-C1 (conformal coating). This page describes the standard unit; confirm the suffix when you need hazardous-location approval or a coated board.
Technical specification
| Parameter | Specification |
|---|---|
| Order number | QS20.241 (also QS20.241-A1 and QS20.241-C1) |
| Output voltage | 24 V nominal, adjustable 24 to 28 V, factory setting 24.1 V plus/minus 0.2 % |
| Output current | 20 A continuous at 24 V; 17 A at 28 V |
| BonusPower | 30 A (720 W) at 24 V and 26 A at 28 V for typically 4 s (min. 3.5 s, max. 4.5 s); recovery time typ. 7 s |
| Output power | 480 W continuous; 720 W short term |
| Ripple and noise | max. 100 mVpp, 20 Hz to 20 MHz; line regulation 10 mV; load regulation 100 mV |
| Short-circuit current | min. 30 A, max. 40 A; max. 14 A average (RMS) |
| Output capacitance | typ. 8 500 uF inside the unit |
| AC input | 100 to 240 Vac plus/minus 15 %, 50 to 60 Hz plus/minus 6 %; 4.56 A at 120 Vac, 2.48 A at 230 Vac; short-term operation down to 60 Vac and up to 300 Vac |
| Power factor / inrush | 0.95 at 120 Vac and 0.90 at 230 Vac; inrush max. 13 A peak, typ. 9 A (120 Vac) and 7 A (230 Vac) |
| Efficiency / losses | 92.4 % and 39.6 W at 120 Vac; 93.9 % and 31.4 W at 230 Vac |
| Hold-up time | typ. 32 ms at 120 Vac; 51 ms at 230 Vac |
| Terminals | Spring-clamp: input and output 0.5-6 mm2 solid, 0.5-4 mm2 stranded (AWG 20-10); DC-OK signal 0.3-4 mm2 solid; 10 mm stripping length |
| Environment | -25 C to +70 C operating (derating 12 W/C from +60 C); -40 C to +85 C storage; 5 to 95 % r.H.; altitude to 6000 m with derating above 2000 m |
| Protection / safety | IP20; overvoltage protection typ. 32 Vdc, max. 37 Vdc; class of protection I; overvoltage category III, pollution degree 2 |
| Dimensions / weight | 82 x 124 x 127 mm (W x H x D); 1 200 g |
| Lifetime / MTBF | Lifetime 71 000 h at 230 Vac, 24 V, 20 A, +40 C; MTBF (SN 29500) 469 000 h at the same conditions |
| Approvals (see datasheet chapter 19) | UL 508, UL 60950-1, IEC 60950-1, IEC 62368-1, Marine (DNV); ATEX, IECEx and Class I Div 2 apply to the -A1 variant as printed |
How BonusPower works in practice
BonusPower is controlled by an internal power manager. When the load exceeds 20 A the supply keeps the output voltage up for about 4 seconds, then falls back to the HiccupPLUS overload mode if the overload persists; it needs about 7 seconds of load below the limit to re-arm. This suits a DC drive, a group of valve actuators or a capacitive load that draws a short inrush, but it is not a way to run a continuous 30 A load. Size the supply for the continuous current and treat BonusPower as the margin.
Installation and selection notes
- Mount on 35 mm DIN rail with 7.5 or 15 mm height, input terminals at the bottom; keep the installation clearances given in chapter 2 of the datasheet.
- Daisy-chaining of outputs is allowed as long as the average current through one terminal pin does not exceed 25 A; use a distribution terminal beyond that.
- Use ferrule-fitted copper wire rated for 60 C, 75 C or 90 C depending on ambient up to 45, 60 and 70 C.
- Accessories in the order list: ZM2.WALL wall bracket, ZM15.SIDE side bracket, YR40.242 and YR40.245 redundancy modules.
- Choose the 3-phase QT40 or XT40 on this site when the cabinet only has a 3-phase supply.
Where it fits in GCC projects
A 480 W 24 V supply is a common choice for PLC cabinets, remote I/O panels and valve control marshalling cabinets in water treatment, pumping stations and utility substations. With full power to +60 C and a single-phase wide-range input it copes with hot cabinets and unstable generator-backed supplies; the unit also tolerates short-term input from 60 Vac. For redundant 24 V rails pair two QS20 units with a YR40 module. See the Power Modules category.
Selection and installation notes
A DIN-rail power supply is selected from the load current plus a margin of about twenty to thirty percent for start-up and ageing. Protect the input with the fuse or breaker the maker names, leave the clearances above and below for cooling, keep the output wiring short and check the output voltage under load. Where redundancy matters, use a decoupling module and two supplies rather than one larger unit.
Information needed for a quotation
Send the full model code, the quantity, the delivery location in Oman or the GCC, the intended use and any accessories needed, so that the complete package can be quoted together.
Documents and supply information
The manufacturer data sheet is attached to this page and should be read together with the project specification and the site risk assessment before a purchase is confirmed. Ratings, standards and dimensions are quoted as printed on that sheet. Lead time, stock position and certificates available with the shipment are confirmed in the quotation, and we supply to Oman and the wider GCC region for industrial, utility and building services projects.
Frequently asked questions
What does BonusPower mean on the QS20.241?
It is a short-term capability of 150 %: 30 A (720 W) for typically 4 seconds at 24 V, with a recovery time of about 7 seconds.
Does the QS20.241 have screw or spring terminals?
It has bi-stable quick-connect spring-clamp terminals for input, output and the DC-OK signal; they ship in the open position.
Is the standard QS20.241 ATEX approved?
The datasheet states ATEX and IECEx for the QS20.241-A1 version only. Order the -A1 suffix if you need hazardous-location approval.
What redundancy modules are listed for it?
The datasheet lists YR40.242 and YR40.245 redundancy modules as accessories.
Who supplies this unit in Oman?
Seven Star LLC is an independent supplier in Muscat and not the manufacturer; check the variant suffix with us before ordering.
Datasheets & Documents
- Datasheet PULS QS20.241 datasheet (Oct. 2025, Rev. 2.5) Download
Reviews (0)
About brand
PULS is a Munich-based manufacturer of industrial DIN rail power supplies, founded in 1980 by Bernhard Erdl. The company develops and produces 24 V single-phase and three-phase power supplies, DC/DC converters, buffer and redundancy modules and DC-UPS units for control cabinets.
Seven Star LLC is an independent supplier in Muscat. We list PULS power supplies and supplementary modules for PLC cabinets, pumping stations, compressor packages and utility panels in Oman and the GCC.
PULS product series
DIMENSION power supplies on this site include the CP10.241 (24 V, 10 A), the CS10.241 with auto-select input, the QS20.241 (24 V, 20 A) and the three-phase CT5.241, QT40.241 and semi-regulated XT40.241 for 40 A. Higher-featured models offer PowerBoost or BonusPower reserves and a DC-OK signal.
Supplementary units include the MLY10.241 dual diode redundancy module, the YR40.242 MOSFET redundancy module for 40 A, the UF20.241 capacitor buffer module that bridges supply interruptions of about 200 ms, and the UB10.241 DC-UPS control unit used with batteries.
Where PULS power supplies are used
24 V supply for PLCs, I/O, sensors and actuators in machine and process control panels, redundant supplies for critical systems, and buffered supplies for controllers that must ride through short mains dips.
Ordering PULS products: what we need
Send the full order code, such as QS20.241, together with the input voltage and phases, output current, ambient temperature and any approvals required, such as UL, marine, ATEX, IECEx or Class I Div 2, which apply only to selected models.
Browse PULS products by category: Power Modules.
Related products
Frequently Asked Questions
What does BonusPower mean on the QS20.241?
It is a short-term capability of 150 %: 30 A (720 W) for typically 4 seconds at 24 V, with a recovery time of about 7 seconds.
Does the QS20.241 have screw or spring terminals?
It has bi-stable quick-connect spring-clamp terminals for input, output and the DC-OK signal; they ship in the open position.
Is the standard QS20.241 ATEX approved?
The datasheet states ATEX and IECEx for the QS20.241-A1 version only. Order the -A1 suffix if you need hazardous-location approval.
What redundancy modules are listed for it?
The datasheet lists YR40.242 and YR40.245 redundancy modules as accessories.
Who supplies this unit in Oman?
Seven Star LLC is an independent supplier in Muscat and not the manufacturer; check the variant suffix with us before ordering.
Reviews
There are no reviews yet.